Mower-knife sharpener



J. CALDWELL.

MOWER KNIFE SHARPENER.

APPLICATION FILED AUG.3. 19w.

1 3 1 3, 790. Patented Aug. 19, 1919.

707z7z dwell mu C-DLUMBIA PLANOORAPH C0 WASHINETON, D C:

To all whom it may concern:

norm CALD ELL, or'connY, rENNsYLvAnIa MOWER-KNIFE snmnmm.

Specification of Letters Patent. 2 Y

Patente ug. 19,1919.

Application filetl August 3, 1917. Serial 1%. 184,290.

Be it known that I, JOHN CALDWELL, a cltizen of the United States, and resident of Corry, in the county of Erie and State of 7 Pennsylvania, have invented certain new and useful Improvements in Mower-Knife Sharpeners, of which the fOlloWing is a specification.

This invention relates to improvements in sharpening devices and it is the principal object of the invention to provide a novel device for sharpening the knives of a lawn mover and which, can be easily attached to the same without alteration thereto.

Among other aims and objects of the mvention may be recited, the provision of a device of the character mentioned with a view to compactness, and in which the number of parts are few, the construction simple, the cost of production small, and efficiency and operation high.

The foregoing together with additional advantageous details and arrangements of parts of the preferred embodiment of my invention will be clear from the specific description hereinafter contained, when read in connectlon wlth the accompanying drawings forming part thereof, wherein said embodiment of the invention is illustrated for the purpose of facilitating a full understanding of the present improvements.

In the drawings "Figural is a bottom plan of a lawn mower with the improved sharpening device ap plied thereto, the side roller of the mower being removed;

Fig. 2 is a vertical section through the 1mproved sharpening device; and

said bracket, screw bolts 4: are passed into Fig. 3 is a-frag'mentary detail in perspective of the sharpening block.

Similar characters. of reference refer to similar parts throughout the several views of the. drawings.

Having more particular reference to the drawings, 1 represents the lawn mower in its entirety, having the usual reel rotatably mounted thereon and carrying curved knives 2.

The improved sharpening device comrises a substantially U-shaped bracket havng a plurality of screw threaded openings formed in the base thereof, the said bracket being designated by the numeral 3. Through the screw threaded openings formed in t e engagement with the handle of the lawn one face thereof concaved as at 8 whereby V the same may be properly engaged by the cuttlng edges of the mower 9 upon rotation of the same. Slotted metal pieces 9 are secured to the opposite side of the block 7 and have slots formed therein arranged adjacent grooves 10 formed in the said block. Into the slots of the pieces or plates 9 and the adjacent grooves 10, the heads of the bolts 6 are passed and are locked in position therein through the medium of wing nuts 11.

It is to be noted, that the sharpening block 7 when properly adjusted is arranged substantially parallel to the shaft carryin the knife reel of the mower and is so spaced with relation to the same as to permit the intermittent engaging of the various cutting edges of the mower knives 2 therewith upon rotation of the same. i I

In operation, when it is desired to sharpen the knives of the lawn mower, the same is turned bottom side up and the sharpening block 7 properly adjusted with relation thereto. The lawn mower is now moved over a surface, causing rotation of the knife carrying reel and as a consequence, the intermittent engagement of the cutting edges of the said knives with the concaved face 8 of the sharpening block 7. In this way, the same will be properly sharpened.

Manifestly, the construction shown is capable of considerable modification and such modification as is within the scope of my claim, I consider within the spirit of my invention.

I claim A blade sharpener for lawn mowers including an abrasive element having transverse recesses formed in one side thereof in spaced relation and opening onto one edge of said element, slotted metalpieces secured to the abrasive element and arranged over the recesses therein, the slots in said pieces being of less widths than the widths of said recesses, headed screw threadedfrods. engaged in the recesses and slots in said metal pieces,

"abrasive element, and attachingmeahs sd cured to a portion of the law-i1 mower. and

through whereby to permit'adjustment of Copies 61 this patent maybe pbtained fi ve centseaeh, by addressing the commissiener pt. Patents; i

I 7 hereto. reeeiving said, screw threaded rods th'erement of the same therewith. 7

JOHN, ALDWEL 7 Washington, .D. G.

I In testimony whereof I aflix my signatlire 2. 

